|Craniosacral therapy (CST)|
"Biodynamic" craniosacral therapy
|NCCIH Classification||Manipulation and body-based|
|Risks||Two known cases of death|
|This article is part of a series on|
|Fringe medicine and medical conspiracy theories|
Craniosacral therapy (CST) is a form of bodywork or alternative therapy using gentle touch to palpate the synarthrodial joints of the cranium. A practitioner of cranial-sacral therapy may also apply light touches to a patient's spine and pelvic bones. Practitioners believe that this palpation regulates the flow of cerebrospinal fluid and aids in "primary respiration". Craniosacral therapy was developed by John Upledger, D.O. in the 1970s, as an offshoot osteopathy in the cranial field, or cranial osteopathy, which was developed in the 1930s by William Garner Sutherland.
According to the American Cancer Society, although CST may relieve the symptoms of stress or tension, "available scientific evidence does not support claims that craniosacral therapy helps in treating cancer or any other disease". CST has been characterized as pseudoscience. Cranial osteopathy has received a similar assessment, with one 1990 paper finding there was no scientific basis for any of the practitioners' claims the paper examined.
History and conceptual basis
Cranial osteopathy, a forerunner of CST, was originated by osteopath William Sutherland (1873–1954) in 1898–1900. While looking at a disarticulated skull, Sutherland was struck by the idea that the cranial sutures of the temporal bones where they meet the parietal bones were "beveled, like the gills of a fish, indicating articular mobility for a respiratory mechanism."
John Upledger devised CST. Comparing it to cranial osteopathy he wrote: "Dr. Sutherland's discovery regarding the flexibility of skull sutures led to the early research behind CranioSacral Therapy – and both approaches affect the cranium, sacrum and coccyx – the similarities end there." However, modern day cranial osteopaths largely consider the two practices to be the same, but that cranial osteopathy has "been taught to non-osteopaths under the name CranialSacro therapy."
Practitioners of both cranial osteopathy and craniosacral therapy assert that there are small, rhythmic motions of the cranial bones attributed to cerebrospinal fluid pressure or arterial pressure. The premise of CST is that palpation of the cranium can be used to detect this rhythmic movement of the cranial bones and selective pressures may be used to manipulate the cranial bones to achieve a therapeutic result. However, the degree of mobility and compliance of the cranial bones is considered controversial and is a critically important concept in craniosacral therapy.
From 1975 to 1983, Upledger and neurophysiologist and histologist Ernest W. Retzlaff worked at Michigan State University as clinical researchers and professors. They assembled a research team to investigate the purported pulse and further study Sutherland's theory of cranial bone movement. Upledger and Retzlaff went on to publish their results, which they interpreted as support for both the concept of cranial bone movement, and the concept of a cranial rhythm. Later reviews of these studies have concluded that their research did not meet enduring standards to offer conclusive proof for the effectiveness of craniosacral therapy and the existence of cranial bone movement.
Primary respiratory mechanism
The Primary Respiratory Mechanism (PRM), the mechanism originally proposed by Sutherland, has been summarized in five ideas:
- Inherent motility of the central nervous system
- Fluctuation of the cerebrospinal fluid
- Mobility of the intracranial and intraspinal dural membranes
- Mobility of the cranial bones
- Involuntary motion of the sacrum between the ilia
Inherent motility of the central nervous system
The postulated intracranial fluid fluctuation is described by practitioners as an interaction between four main components: arterial blood, capillary blood (brain volume), venous blood and cerebrospinal fluid (CSF).
Fluctuation of the cerebrospinal fluid
There is research which demonstrates examiners are unable to measure craniosacral motion reliably, as indicated by a lack of inter-rater agreement among examiners. The authors of this research conclude this "measurement error may be sufficiently large to render many clinical decisions potentially erroneous". Alternative medicine practitioners have interpreted this result as a product of entrainment between patient and practitioner, a principle which lacks scientific support. Whether craniosacral motion can be reliably palpated remains a subject of debate with studies producing mixed results.
Mobility of the intracranial and intraspinal dural membranes
In 1970, Upledger observed during a surgical procedure on the neck what he described as a slow pulsating movement within the spinal meninges. He attempted to hold the membrane still and found that he could not due to the strength of the action behind the movement.
Mobility of the cranial bones
The extent to which cranial bones are able to move is considered controversial and studies of the existence and degree of cranial motion have yielded mixed findings. Cranial sutures are the areas in which the eight cranial bones are joined. During infancy, the cranial bones are not rigidly fused to each other, but are instead bound together by a membrane known as a fontanelle where two sutures join. Between the first and second year of life, the cranial bones begin to move together and fuse as a normal part of development. Studies examining the age of the closure of the cranial sutures have reported mixed findings. Closure has been reported to occur during adolescence while other studies indicate greater individual variability in the timing of this closure with fusion of the lambdoid suture, sagittal suture, and coronal sutures taking place in the fourth decade of life, but complete fusion of all sutures not occurring until advanced age (the eighth decade of life has been reported); some studies have found that the sutures never rigidly fuse. According to Gray's Anatomy, "[w]hen such sutures are tied by sutural ligament and periosteum, almost complete immobility results".
The therapist lightly palpates the patient's body, and focuses intently on the communicated movements. A practitioner's feeling of being in tune with a patient is described as entrainment. Patients often report feelings of deep relaxation during and after the treatment session, and may feel light-headed. While sometimes thought to be caused by an increase in endorphins, research shows the effects may actually be brought about by the endocannabinoid system.
There are few reports of adverse events from CST treatment. In one study of craniosacral manipulation in patients with traumatic brain syndrome, the incidence of adverse effects from treatment was 5%.
According to the American Cancer Society, although CST may relieve the symptoms of stress or tension, "available scientific evidence does not support claims that craniosacral therapy helps in treating cancer or any other disease". Cranial osteopathy has received a similar assessment, with one 1990 paper finding there was no scientific basis for any of the practitioners' claims the paper examined.
In October 2012 Edzard Ernst conducted a systematic review of randomized clinical trials of craniosacral therapy. He concluded that "the notion that CST is associated with more than non-specific effects is not based on evidence from rigorous randomised clinical trials." Commenting specifically on this conclusion, Ernst commented on his blog that he had chosen the wording as "a polite and scientific way of saying that CST is bogus." Ernst also commented that the quality of five of the six trials he had reviewed was "deplorably poor", a sentiment that echoed an August 2012 review that noted the "moderate methodological quality of the included studies."
Ernst criticized a 2011 systematic review performed by Jakel and von Hauenschild for inclusion of observational studies and including studies with healthy volunteers. This review concluded that the evidence base surrounding craniosacral therapy and its efficacy was sparse and composed of studies with heterogeneous design. The authors of this review stated that currently available evidence was insufficient to draw conclusions.
The evidence base for CST is sparse and lacks a demonstrated biologically plausible mechanism. In the absence of rigorous, well-designed randomized controlled trials, it has been characterized as pseudoscience, and its practice called quackery.
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